New data points about digital ad spending bode well for streaming-device maker Roku, prompting a stock rating upgrade from one formerly bearish analyst. Seaport Research Partners analyst David Joyce is moving to a neutral rating from sell on the company after recent channel checks found digital ad buyers for a range of industry verticals and portfolio sizes are spending in the mid- to high-teen percentages within the ad-based streaming and internet-connected TV spaces. These new data points convey a 12% expected growth level for Roku’s 4Q, up from previous estimates for about 9.1% growth, Joyce says. He notes too that Roku has maintained its usage share and has a stronger demand profile among streamers.